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Q.

A thin copper wire of length L increases by 1% when heated from 0oC to 100oC. If a thin copper plate of area 2L × L is heated from 0oC to 100oC. The percentage increase in the area of the plate will be

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a

6%

b

2%

c

1%

d

4%

answer is D.

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Detailed Solution

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∆ll=αt=1% and ∆AA=βt=2αt=2 x 1=2%

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